电气设备的外壳失去了耐爆性和隔爆性叫做(),该设备不得再用于煤矿井下。
A.电气设备失爆
B.电气设备失灵
参考答案:A
Li Jie is _______________. [ ]
A. mine friend
B. friend of my brother
C. a friend to my brother
D. a friend of my brother's
肺的功能是()
A.生气
B.纳气
C.主气
D.载气
E.行气